Registration year before of the build year?

[crosser]

Hi everybody.
I'm building my own road legal race car from scratch, and I saw that there are a lot of cars registered at the 80's like a classic cars.
Can somebody explain me how could I do it? I search a lot of documentation in a lot of places, but I don't find anything.
The car will be motorcycle engined, from a R1, hayabusa or something like that.

Thanks in advance

Guillermo

[crosser]

Thanks you Adit, this is the theme that I want to talk about:

how many parts I need from the donor, and what parts must be? There are any place where I can find some documentation about this?

Thanks you

Guillermo